worked on 3d models within map

adjusted grid factory
adjusted nav mesh factory
minoor changes/fixes
new helper classes
refactoring

geo/BBox3.h

@@ -54,6 +54,9 @@ public:
 	/** get the bbox's maximum */
 	const Point3& getMax() const {return p2;}
 
+	/** get the bbox's size */
+	const Point3 getSize() const {return p2-p1;}
+
 	/** equal? */
 	bool operator == (const BBox3& o) const {
 		return	(p1.x == o.p1.x) &&
@@ -86,11 +89,11 @@ public:
 		p2 += p;	// increase maximum
 	}
 
-        /** set both, min/max z to the same value */
-        void setZ(const float z) {
-            p1.z = z;
-            p2.z = z;
-        }
+		/** set both, min/max z to the same value */
+		void setZ(const float z) {
+			p1.z = z;
+			p2.z = z;
+		}
 
 	/** does the bbox contain the given point? */
 	bool contains(const Point3& p) const {